Скачать или смотреть Mastering JavaScript's `endsWith` Method

Summary: Discover how to efficiently use the `endsWith` method in JavaScript to check if a string ends with a specified substring, along with comparisons to `startsWith`.
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Mastering JavaScript's endsWith Method: A Comprehensive Guide

Introduction

Working with strings is a fundamental aspect of JavaScript programming. One powerful method available for string manipulation is endsWith(). This method is used to determine whether a string ends with a specified substring. In this guide, we will explore the endsWith method, its syntax, use cases, and also draw comparisons with the startsWith method.

What is endsWith in JavaScript?

The endsWith method checks whether a given string ends with the characters of a specified substring, returning true or false as appropriate. This can be extremely useful for validation checks, parsing file types, or even for basic string comparison tasks.

Syntax of endsWith

Here's the basic syntax of the endsWith method:

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searchString: The characters to be searched for at the end of the string.

length (optional): If provided, it is used as the length of the string. The method will consider only up to this length.

How to Use endsWith in JavaScript

Example 1: Basic Usage

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In this example, message.endsWith("world!") returns true because message ends with "world!". Conversely, message.endsWith("hello") returns false.

Example 2: Using the Optional Length Parameter

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In this example, using the optional length parameter alters the behavior of the endsWith method by limiting the string's length.

String startsWith and endsWith in JavaScript

The startsWith and endsWith methods serve similar purposes but operate at opposite ends of the string:

startsWith: Check if a string begins with a specified substring.

endsWith: Check if a string ends with a specified substring.

Example: Comparing startsWith and endsWith

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Both startsWith and endsWith are invaluable for various string validation and processing tasks. Picking the right method boils down to your specific needs in the application.

Conclusion

Understanding how to use the endsWith method in JavaScript can significantly enhance your string manipulation capabilities. Whether you're validating file types, implementing search functionalities, or performing data validation, endsWith is a method worth mastering. Additionally, knowing how endsWith compares with startsWith can help you choose the appropriate method for different scenarios.

Happy coding!